The group fled the reserve before the girl walked to a home where police were called. She was taken to hospital for treatment.

Blacktown detectives and the State Crime Command’s sex crimes squad are investigating. The men were described as being of African appearance and aged in their late teens to early 20s.

Central Coast police were reviewing CCTV footage in relation to the sexual assault of the 15-year-old the same night during the match between the Central Coast Mariners and the Melbourne Victory at Bluetongue Stadium in Gosford.

The girl was reportedly with a friend at the game when a man inappropriately touched her.

The alleged incident happened near the ground’s eastern exit gate about 7.35pm.

Gosford Chief Inspector Steve Kentwell said that the teen was “very upset” after the incident.

“We are reviewing CCTV, which may have captured it, to identify who the person is,” he said. “At this stage we are appealing to see if anyone saw the event.”

Police have described the alleged offender as of caucasian appearance with black or brown hair, about 178cm in height, of slim build and wearing a white T-shirt and long blue pants.

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